Philips LF501EM4 - Audio Is Not Output Normally

8-4 FL13.16ATR
[Audio Signal Section]
SP3801, SP3802 or CL3801 may be defective.
Check and replace these parts.
Audio is not output normally.
FLOW CHART NO.1
Are the audio signals output to Pin(1, 2, 3, 4) of CN3801?
Replace the Digital Main CBA Unit.
No
Ye s
Is approximately +13V voltage supplied to
Pin(15, 16, 17, 18) of CN501?
Is
approximately +
3.3V voltage supplied to Pin(8) of
CN501?
No
No
Ye s
See FLOW CHART NO.7 <AL+3.3V is not output.
[Power Supply Section]>
See FLOW CHART NO.6 <AMP+13V is not output.
[Power Supply Section]>
Ye s